The screen-making process of screen printing meshs is generally relatively simple, and it is necessary to first coat the screen printing screen with a liquid water-based photosensitive emulsion. To block all the small holes, and then put the screen printing screen in a relatively dry box to dry. When making a plate, it is necessary to wind the original positive image of the printed image on a screen-printed cylinder coated with a photosensitive emulsion and expose it with a UV light source. roller). After the exposure is completed, the screen plate is washed in an automatic plate processor, and the unexposed emulsion is washed away. At this time, the mesh of the graphic portion is left.
After the above steps, the cylinder of the printing plate can be printed on the machine. The difference between Heping and screen printing is that in the rotary screen printing, the scraper is fixed inside the printing plate cylinder. Before printing, first The inside of the cylinder is filled with ink. When printing, it relies on the rotation of the screen plate cylinder to make the ink penetrate through the printing material under the pre
ssure of the squeegee. After the printing is completed, the printing plate can be washed and stored with corresponding post-press equipment. In case of reprinting. The emulsion layer of some screen plates (such as some screen plates of Stork) can also be completely peeled off, and then used for coating and imaging.
The speed of screen printing mesh is usually 75 feet / minute to 150 feet minute, but if printing thicker ink layer, the speed will be slower; if the intermediate drying time is longer, the speed of rotating screen can also reach 150 Feet / minute to 350 feet / minute. In fact, the speed of the rotary screen printing machine itself is not limited (its speed can be as high as 600 feet per minute), the real limiting factor is the ink and its drying performance.
The above is the related technical process of screen printing mesh. The quality of screen printing screens is also very important, and you must choose a big brand: such as maishi Group.
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